XX XXBalmoral SBR installation and XXowners manual (PDF 518kb)
Balmoral SBR process description
The SBR range uses an aeration process known as activated sludge, but operates on a storage and batch treatment cycle which ensures full treatment of all the effluent - even under peak flow conditions.
Crude sewage enters the Primary Settlement Tank (PST) (1) where gross solids settle out and the supernatant liquor remaining near the surface can be drawn off. Substantial “buffer” storage volume is provided in the PST to cope with even the most extreme peak flow loadings (2).
A set volume (or batch) of the liquor is transferred to the Reactor Vessel (RV) by an “air-lift” pump (3) where it is mixed and aerated by a powerful air bubble diffuser (4) for a period of 4 to 6 hours. During this aeration cycle efficient oxygen transfer cultures a dense “soup” of bacteria (the active sludge) which feeds on the sewage liquor thereby removing most of the organic pollutants. After aeration, the bubble diffuser is switched off and there is a settling period (normally two hours) during which the dense activated sludge sinks to the bottom of the RV leaving behind the clarified effluent, (5) which is then discharged into the drain by a second “air-lift” pump (6).
(7) Sensor 1 (8) Sensor 2
All functions within the tanks are operated by air power which is supplied by an electric air compressor and the system is controlled by an integrated programmable unit which monitors the process to take account of flow conditions.
For instance - under very low or zero flow the controller automatically alters to “holiday mode” which aerates the activated sludge on a two hour cycle thus maintaining the oxygen supply to the bacteria. When sufficient flow resumes the system reverts to the normal treatment cycle.
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